CPT email notification including only new value custom fields

From your explanation, it seems that we need wp_mail() function and post_updated hook.

wp_mail() reference: https://developer.wordpress.org/reference/functions/wp_mail/
post_updated action hook: https://developer.wordpress.org/reference/hooks/post_updated/

<CPT_name> – replace this with your custom post type key.

(Untested code – it should give you a good idea of what needs to be done)

add_action('post_updated', `send_custom_update`, 10, 3);
function send_custom_update($post_ID, $post_after, $post_before) {

  if(get_post_type($post_ID) == '<CTP_name>') {

     $to = '[email protected]';
     $subject = get_the_title($post_ID) . ' has been updated!';
     $body = 'The email body content';
     $headers = array('Content-Type: text/html; charset=UTF-8');
 
     wp_mail( $to, $subject, $body, $headers );

  }
}

If you look at the documentation of this action hook you will see that there are two versions of the post available – before and after edit. You might use them in the $body – but that is up to you.

Let me know if this helps.

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